[DISCO-3583] Add client for Merino Suggest

CHANGELOG.md

@@ -11,6 +11,15 @@
 - New `allow_empty_passwords` feature flag to allow storing logins with empty passwords. This feature is intended to be enabled on desktop during the migration.
 - Add `ignore_form_action_origin_validation_errors` feature flag that allows logins with non-URL `form_action_origin` values (e.g. "email", "UserCode") to be imported without error. URL normalization for valid URLs is still applied.
 
+### Merino Client
+- Added a client for the merino suggest endpoint
+- Added a `suggest` subcommand to `merino-cli` for locally testing the suggest endpoint.
+
+## ✨ What's Changed ✨
+
+### Merino Client
+- `merino-cli` now supports subcommands: `recommendations` for curated recommendations and `suggest` for the suggest endpoint.
+
 [Full Changelog](In progress)
 
 # v150.0 (_2026-03-23_)

DEPENDENCIES.md

@@ -485,6 +485,7 @@ The following text applies to code linked from these dependencies:
 [fallible-streaming-iterator](https://github.com/sfackler/fallible-streaming-iterator),
 [fastrand](https://github.com/smol-rs/fastrand),
 [ffi-support](https://github.com/mozilla/ffi-support),
+[find-msvc-tools](https://github.com/rust-lang/cc-rs),
 [fnv](https://github.com/servo/rust-fnv),
 [foreign-types-shared](https://github.com/sfackler/foreign-types),
 [foreign-types](https://github.com/sfackler/foreign-types),

components/merino/Cargo.toml

@@ -9,7 +9,7 @@ uniffi = { version = "0.31" }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 url = "2"
-viaduct = { path = "../viaduct" }
+viaduct = { path = "../viaduct", features = ["ohttp"] }
 error-support = { path = "../support/error" }
 thiserror = "2"
 

components/merino/src/lib.rs

@@ -5,12 +5,19 @@
 
 //! This crate is a cross-platform client library for Mozilla's Merino service.
 //!
-//! It provides a [`CuratedRecommendationsClient`](curated_recommendations::CuratedRecommendationsClient)
-//! that fetches curated content recommendations (articles, stories) from the Merino backend,
-//! powering features like Firefox's New Tab page.
+//! It provides two clients:
+//!
+//! - [`CuratedRecommendationsClient`](curated_recommendations::CuratedRecommendationsClient) —
+//!   fetches curated content recommendations (articles, stories) from the Merino backend,
+//!   powering features like Firefox's New Tab page.
+//!
+//! - [`SuggestClient`](suggest::SuggestClient) —
+//!   fetches search suggestions from the Merino suggest endpoint,
+//!   powering features like Firefox's address bar suggestions.
 //!
 //! This crate uses [UniFFI](https://mozilla.github.io/uniffi-rs/) to generate cross-platform
 //! bindings for Android and other targets.
 
 pub mod curated_recommendations;
+pub mod suggest;
 uniffi::setup_scaffolding!("merino");